Fire-box for boilers



(No Model.)

W. MGCOMBIE.

PIRE BOX FOR BOILERS. No. 478,628. Patented July 12, 1892.

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WILLIAM MCCOMBIE, OF CHICAGO, ILLINOIS.

FIRE-BoxvF'oR BOILERS.

SPECIFICATION forming part of Letters Patent No. 478,628, dated July 12, 1892.

Application tiled November l2, 1891. Serial No. 411,704. (No model.)

To a/ZZ whom it may concern:

Be it known that I, WILLIAM McCoMBIE, a citizen of the United States, residing at.Chi cago, in the county of Cook and State of Illinois, have invented certain new and useful Improvements in Fire-Boxes for Boilers, of which the following is a specification, reference beinghad therein to the accompanying drawings, in which- Figure l represents a vertical sectional view of the fire-box of alocomotiVe-boiler furnace; Fig. 2, a transverse sectional view thereof on the line 2 2 of Fig. l, and Fig. 3 a detail transverse sectional View of one of the slabs of the flue-walls.

This invention is designed to effect a perfect combustion of the fuel in the fire-box, whereby waste of heat and fuel will be reduced to a minimum and the consumption of the smoke effected before it leaves 'the fireboX; and it consists of certain novel features of construction that will be fully hereinafter described, and particularly pointed out in the claims appended.

In the drawings annexed, a designates the fire-box of the boiler, which is provided with the usual door a', and from whose forward end extend the usual re-flues c, through which the products of combustion pass on their way to the smoke-stack.

In the bottom of the fire-box is the grate b,

which consists of the usual tranverse rockingV sections connected together and operated in the usual manner. These grate-sections are arranged in the usual manner, except that instead of all 'of them being in a horizontal plane the rear sections incline upwardly toward the fire-door d', whereby when they are shaken the partly-consumed coal nearest the door is thrown toward the forward end of the fire-box, so that the black smoke produced by the shaking will have to pass over the live coal on its way to the smoke-consuming passage above, and will be thereby partly or wholly consumed.

Arranged entirely withinl the fire-boX between the grate and the flre-flues are two transverse diagonal partit-ions or walls d d', of re brick or other refractory material, which extend entirely across the nre-box from side to side. These walls are arranged a suitable distance apart and are so constructed a point above the door downwardly to near f' the front wall of the lire-box, and the upper wall d projects upwardly and rearwardly from a point above the front end of the lower wall and terminates near the rear wall of the firebox, thus forming a smoke-consuming passage or flue extending from the forward end of the fire-box upwardly and rearwardly to a point above the fire-door. These walls are formed of transverse slabs or bricks, whose ends rest upon parallel flanges d, secured to the sides ofthe fire-box, or they may be supported on tubes or water-dues, and they are made removable, so that they may be renewed and repaired when required. The bricks may have strips of wirenetting moldedin them, as shown in Fig. 3, to strengthen them, if desired.

Communicating with the smoke-consuming flue through the side walls ofthe fire-box are two series of gas nozzles or pipes e, one series entering from each side wall of the fire-box. These nozzles are preferably arranged along the central line of the flue. Connected to these nozzles are gas-supply pipes c', which communicate with a suitable source of supply. (Not shown.) The sgas is preferably forced in through these nozzles under pressure by suitable means, so as to produce a series of very hot names within the flue.

In operation, it will be observed, all the smoke and gases of combustion are compelled to pass to the forward end of the lire-box and then up through the flue formed by the walls before entering the fire-flues. The gas, which is preferably forced in under pressure, entering the flue from opposite sides through the nozzles, produces a series of very hot jetiaines, through which the products of combustion are compelled to pass on their way out of the furnace. These forced jet-flames, coming in from opposite sides of the fire-box, produce an intense heat in the Hue, which will serve to effectually consume all the combustible gases and smoke produced by the combustion of the coal on the grate, thereby reducing the deposits in the flre-flues of the boiler and the escape of smoke from the stack to a minimum. This effectual consumption ICO4 ot' the fuel by the gas-j ets necessarily prevents a large waste of fuel and enables me to obtain from the fuel burned its maximum of heat. It is thought that it will only be necessary to employ the gas-jets until the fire on the grate is well started, as by that time the fire-brick walls will probably be so intensely heated as to serve to consume the smoke, &c., without the jets. Suitable valves or cocks will ot' course be placed in the gas-pipes to regulate the snpply of gas to the fire-box.

While this furnace is especially designed for locomotives, it is evident that it may be employed in connection with stationary boilers with equal advantages.

Having thus fully described my invention, what I claim, and desire to secure by Letters Patent, is

l. In combination with a boiler fire-box, transverse portions therein forming a flu-e through which the products of combustion must pass on their Way to the fire-lines, yand gas-pipes entering the line from the side thereof, as and for the purpose described.

2. The combination of a tire-box, a refractory Wall d therein extending forwardly from the rear Wall and terminating near the front Wall, another Wall d above the wall d and projecting rearwardly from the forward Wall to near the rear Wall of the fire-box, and gaspipes leading into the fine formed by the two Walls, as and for the purpose described.

3. The combination of a fire-box, a downwardly and forwardly projecting transverse refractory wall therein, this wall terminating near the frontwall of the tire-boxandcomposed of removable bricks, another wall above said wall, this latter wall being constructed of removableA refractory bricks and extending rearwardly from the front wall to near the rear wall of fire-box, and a series of gas-nozzles entering the flue formed by the walls above mentioned, as and for the purpose described.

In testimony whereof Iaftix my signature in presence of two witnesses.

WILLIAM MOCOMBIE.

Witnesses:

WILLIAM T. WARNER, XVILLIAM WEBER. 

